Processes Introduction and Management

Note: Processes and Task Automation

Introduction to Processes :

processes is Program running in the Background of a system.
they are Managed by the Kernel.
the kernel Assign's the Process that has a unique PID and it gets incremented for the order. Example 60th proccess = PID 60.

Viewing Process `ps` `ps aux`:

ps => display current proccess runed by the user
ps aux => display current proccess runs on the system and   all users.

ps:

ps aux:

Important Columns in `ps aux`:

USER : the user who initiated the process
PID : the Process id
%CPU : CPU usage in %
COMMAND : the Command that started the Process

#resources/linux/proccesses/ps

Filtering Process use `grep`:

# in other tab start Metasplolit
msfconsole
ps aux | grep msfconsole

by using ctrl + shift + F:
by grep:

#resources/linux/proccesses/manage

Managing Processes:

Kill and types
proccess priority with nice
running poccess in background
foregrounding proccess
scheduling process and automation cron and at overview

Finding greediest process with `top` or the modern option `htop`:

the top or htop comes in handy if u want to find the greediest process.

top
htop

Note ps vs top:

ps = ordered by the pid ascending order
top = order by by the greediest.

#resources/linux/proccesses/manage

Stop (`kill`) process:

kill this command does what it says it kills the proccess but there are some options they way to end the proccess.
We can stop a proccess by using top shutdown the proccess by pressing F9 and then you have to choose the kill signals.
u can use kill command for faster approach kill [pid] it will preform the default kill options => SIGTERM.
syntax for kill in terminal:

kill -(n) [pid]
kill -9 1333
     SIGKILL

Comman `kill`signals options:

SIGUP -1 => stops and restart proccess with same id
SIGSTOP -19 => stop/suspend a proccess
SIGINT -2 => the interupt the weakest kill sgnal
SIGQUIT -3 =>  terminates a proccess the saves it in file named core
SIGTERM -15 => the default kill signal and do clean up tasks
SIGKILL -9 => the absolute kill signal it forces the proccess to s
stop by sending to /dev/null and doesnt do cleanup.

ex: using kill command to Stop a process: am killing my Metasploit sessionkill 91475

ex: Using `htop` kill a process:

Running process in background:

This is helpful when u need to open a Tool or Application and use the same terminal session

[tool/application] &
# dont forget[and]
firefox &

ex: mousepad & -> it will this text editor and it will be running in Background.

foregrounding a process :

The fg command in Linux brings a background job to the foreground. It lets you continue working with a paused or background-running task in your terminal.
Just type fg to resume the most recent job, or fg %job_number or fg [pid] if it was running in background[&] for a specific one.
jobs command to view job and jon number [n].
suspend the msfconsole by pressing ctrl + z then run fg
command then press ctrl+c to bring the session back to normal
- if the fg only has on job running in the foreground
if running multiple %jobs example use fg %Job_num:
viewing running jobs command

Task and job management Automation (Introduction)

scheduling process and automation cron and at overview
create a small script
To test at and cron i wrote simple bash script down below.
create .sh format and sudo chmod +x script.sh
then execute ./script.sh

Processes Introduction and Management

Processes Introduction and Management

Note: Processes and Task Automation

Introduction to Processes :

Viewing Process ps ps aux:

Important Columns in ps aux:

Filtering Process use grep:

Managing Processes:

Finding greediest process with top or the modern option htop:

Stop (kill) process:

Comman killsignals options:

ex: Using htop kill a process:

Running process in background:

foregrounding a process :

Task and job management Automation (Introduction)

Viewing Process `ps` `ps aux`:

Important Columns in `ps aux`:

Filtering Process use `grep`:

Finding greediest process with `top` or the modern option `htop`:

Stop (`kill`) process:

Comman `kill`signals options:

ex: Using `htop` kill a process: